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(Mam I. W. GLAZ'IER.

TENSION DEVICE FOR SEWING MACHINES- v No. 270,188. Patented Jan. 2, 1883.

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' UNITED STATES PATENT OFFICE. I

IRA W. GLAZIER, on MILLBURY, MASSACHUSETTS, ASSIGNOR OF ONE-HALF T CHARLES OLMSTED THOMPSON, on NEW YORK, N. Y.

specification.

TE NSION DEVICE FOR SEWING-MACHINES.

SPECIFICATION forming part of Letters Patent No. 270,188, dated January 2, 1883.

ApplicationfiledOctoberlll,1882. (Nomodel-l 1'0 all whom it may concern:

Be it known that 1,1RA W. GLAZIER, a citizen ofithe United States, and residing at Millbury, in the county of Worcester and State of Massachusetts, have invented new and useful Improvements in Tension Devices for Sewing- Machine Spools, of whichthe following is a My invention consists of a regulator incombination with the flier-guide, by which the thread is led oft from the spool on the spindle whereon the said flier-guide swings, and by its 'm's inertia: compensates for the irregularities of tension by overrunning the flier-guide when it slacks by increased resistance of the unwinding thread, and falling back when the speed of the flier-guide is accelerated by diminished resistance, all as hereinafter fully described, reference being made to the accom panying drawings, in which- Figure 1 represents in perspective view a large commercial spool such as is employed for delivering thread to sewing-machines used in manufacturing establishments, together with the ordinary iiierguide for taking off .the thread, with my improved regulator applied thereto. Fig. 2, is a perspective of a detail of the device.

I arrange the spool to on a vertical spindle, I), fixed in any suitable base, and extending up a suitable distance through the top of the spool, and mount the flier-guide c thereon. said guide being formed on the lower end of the vertical arm d, turned downward along the side of the spool from the horizontal arm 0, ex-

bending over the top of the spool to the spindle, and connected therewith bythe coil f, suitably t'or revolving freely on the spindle by the efiect of the thread as it is rapidly drawn off from the spool by the machine to which it passes in any desired-direction after leaving the stationary guide 9.

I make a guide, It, at the angle between the arms d and e and directly over the guide c,in order that the thread may be led from said guide 0, so as not in any case to have contact with the head of the spool in case it runs slack,

1 to prevent it from being caught thereon by any roughness ofthe surface, which sometimes exists to such extent as to materially interfere i with the proper delivery of the thread.

Over the flier-guide c, I mount the regulatorguidej of my invention, which is formed on the end of an arm, 70, projecting from a coil, l, by which said arm is mounted on the spindle 5 b above the coil f, and with an intervening washer, 'm, to prevent any conflict of the respective coils, and through this guide I pass the thread from guide 0 to 9, preferably passing it also through guide h';.=but said guide it may be omitted, if preferred, although I find it very useful for the purpose above stated. Y

It will be readily seen that the M8 inertia: of the guide j will largelycounteract the irregularities in-the tension of the thread caused 6 5 bythe varying resistance of the unwinding, due to the ditt'erences of the adhesion of the threads in difierent parts of the spool by the overwindin g of some coils of thread on others, and by other conditions.

While Lprefer to make arms k and edindependent-1y of each other, they maybe connected by connecting the coils f l, or by making the'whole in one piece of wire, the spring of the coil being depended on for the compensat- 7 5 ing action of the gu'idej, said coil being made sufficien tly light for the purpose, and the guide j being made heavier, if desired; but the range of the regulator will not be'a's great as when the said guide is made separately from guide c, as here shown. In practice the guidec will be extended less than half the length of the spool from the top downward, because'its function is mainly to guide the thread downward from near the top of the spool, so as to clear the head of the spool. From the lower portion of the spool the thread runs upward more naturally and with less obstruction. than it runs from the upper part downward, thereby making a better contrivance by locating guide 0 well up near the top of the spool.

It will be seen that in case the guide c should by its momentum overrun guide j by reason of anysudden slacking of the tension the slack will'be taken up by the guide jfollowing bebind, and should guide 0 fall back by greater tension the momentum of guidej will be added to that of guide 0, to facilitate the detach ment of the thread from the spool. Generally the two guides will run together-that is to say, so that the .line of the thread will be straight, or thereabout, from guide h to y when the tension is uniform.

It will also be seen that the guide 0 being located near the top of the spool will prevent the thread from falling over and getting under the lower spool-head when the machine stops and the thread slackens, which occurs when the guide runs too low or when a gravityguide drops to its lower position.

For the purpose of connecting all the parts of the tension device together to enable them to be more readily taken off and put on the spindle when the spools are changed, I propose to employ a tube, 11, with washer nattached near the-lower end, on which coilfrests, and havingwasher m fitted loosely on it for the coil 1 to rest on, and also having a cap, 0, at the top, which may be permanently ordetachabl-yconnected as preferred, said tube being fitted to be readily put on and taken ofl the spindle.

Having thus described my invention, what I claim, and desire to secure by Let-ters'Patent,

1. The combination, in a thread-tension device for sewing-machine spools, of the regulator-giiidej with the flier-guide c, spool a, and the guide g, substantially as described.

2. The combination, in a thread-tension device for sewing-machine spools, 0f the regulator-guide j with the flier-guides c and h, spool a, and the guide g, substantially as described.

3. The combination, in a thread-tension device for sewing-machine spools, of the regulator-guidej and flier-guide c, said guides being mounted on the spindle b by coilsf and l, substantially as described.

4. The combination of the connecting-tube b, washers m n, and cap 0 with the guides cj and the spindle 12, substantially as described.

5. The guides c and j. mounted on a connecting-tube, b, substantially as set forth, in combination with spindle b and spool a, substantially as described.

In witness whereof I have hereunto signed my name in the presence of two subscribing witnesses.

A. P. THAYER, W. J. MORGAN. 

